FR2870623A1 - Barrier for fence, has sensor mounted on post and that detects movement of intermediate section of wire, where section of wire is held by suspension unit tensioning wire and is connected to main sections of wire - Google Patents

Abstract

The barrier has a sensor (37) mounted on one of two posts and that detects the movement of an intermediate section (36) of a wire. The section (36) is held by a suspension unit (34) tensioning the wire and is connected to main sections (33, 35) of the wire. The sections of the wire are held between the posts and provided along the length of the wire between ends of the wire and the unit (34). An independent claim is also included for a fence comprising a barrier.

Description

The invention relates to a wire barrier stretched between uprights.

  One area of application is fences designed to prevent the intrusion of people into a site, such as a military zone or others.

  In this type of barrier, the wires serve not only to form a physical obstacle to the passage of people between the two end posts between which are stretched son, but also serve to detect a possible intrusion or attempted intrusion through it.

  Document FR-A-2 820 865 thus discloses barriers comprising for this purpose between the two end posts a detector post carrying a sensor for detecting the movement of the wires.

  These barriers therefore have the disadvantage of requiring three posts for each barrier, which is expensive and complicated assembly, especially given that it is necessary to distinguish between the end posts and the detector post.

  A single wire barrier is also known that can conduct an electrical signal and does not include a detector post between the two end posts. The yarn is returned up and down between the two end poles by pulleys provided thereon. At the top and bottom of one of the end posts, the wire is clamped into two upper and lower disks, and then connected to an electrical sensor mounted on that pole, to detect disturbances in the electrical signal of the wire.

  This barrier has the disadvantages inherent in the use of a single wire. In this case, the different lengths of the wire between the poles form a series circuit for the intrusion detection.

  While detection covers the full height of the barrier, it is less sensitive at mid-height than at the top and bottom.

  In addition, this barrier requires the use of a particular electrical sensor and adequate signal processing, which are not always desirable and can be very complicated.

  The object of the invention is to obtain a barrier and a fence comprising the latter, which overcomes the drawbacks of the state of the art, ensures reliable detection, is easy to mount and economical, while dispensing with intermediate detector pole.

  For this purpose, a first object of the invention is a barrier comprising two first and second uprights, which support and between which are stretched son intended to form an obstacle to the passage of people, and at least a first displacement detection sensor a first son, characterized in that on the second upright are mounted means for returning and tensioning the first wire and the sensor for detecting the displacement of an intermediate section of the first wire, this intermediate section of the first wire being continuous tensioned by the return and tensioning means of the first wire and connected to two main sections of the first wire, which are stretched between the first and second uprights and which are along the length of the first wire between the two ends of the first wire and the return and tension means of the first wire, said first wire being called the first wire of detection.

  Thanks to the invention, the detection is not dependent on a single type of sensor, several types of sensors can be provided on the intermediate portion of the wire. The sensor detects the displacement of the wire on the intermediate portion thereof, which, because of the return and tension means, transmits the movement of the main sections of the wire which would be due to an attempt by a person to remove the one of these main sections.

  According to other features of the invention, the first wire is fixed at both ends to the first leg and the return and tension means of the first wire are mounted only to the second leg; Said wires comprise at least a second wire fixed at its two ends to the second upright and passing in return and tensioning means of the second wire, mounted only on the first upright, on which a displacement detection sensor is provided. an intermediate section of the second wire, the intermediate portion of the second wire being continuous, stretched by the return and tension means of the second wire and connected to two main sections of the second wire, which are stretched between the first and second uprights and which lie along the length of the second wire between the two ends of the second wire and the return and tensioning means of the second wire, said second wire being called the second wire of detection, the main sections of the first and second alternating wires; the return and tensioning means of the detection wire comprise at least two return and tensioning means of the detection wire in at least two locations different from its length, the sensor for detecting the displacement of the detection wire being provided on the intermediate section thereof, located between said two places; the sensor for detecting the displacement of the detection wire comprises a mobile detection part displaced by the intermediate section of this detection wire; the return and tensioning means of the detection wire comprise at least two remote pulleys for returning the detection wire, delimiting between them the intermediate section of this detection wire; the displacement detection sensor and the return and voltage means are integrated in the amount on which they are provided; the sensor for detecting the displacement of the detection wire comprises a mobile part, fixed to the intermediate section of this detection wire according to at least one degree of freedom thereof, and a detector for displacing the moving part with respect to a equilibrium position of the sense wire; the displacement detector of the moving part is without mechanical contact with this moving part; the displacement detector of the moving part is of the magnetic type; the moving part of the sensor for detecting the displacement of the detection wire is formed by a lever oscillating with respect to at least one axis of rotation transverse to the detection wire, the lever being fixed by a first side to the intermediate section of the detection wire; following at least the direction of longitudinal displacement thereof and having a second side, which is opposite to the first side with respect to the axis of rotation and whose displacement is detected by the detector; the second side of the lever carries a magnet cooperating with the detector; the second side of the lever is further from the axis than the first side; the displacement detection sensor has travel limiting stops on the second side of the lever.

  A second object of the invention is a fence comprising at least one barrier as described above.

  The invention will be better understood on reading the following description, which is given solely by way of nonlimiting example with reference to the appended drawings, in which: FIG. 1 is a diagrammatic front view of an embodiment of FIG. the barrier according to the invention - FIG. 2 schematically shows an enlarged front view of a post of the barrier according to FIG. 1; - FIG. 3 schematically represents in longitudinal section a sensor present on the post according to FIG. 2, and Figure 4 shows schematically in front view a fence post in the case of uneven ground.

  In FIG. 1, on the barrier B, the two uprights 1, 2 for supporting the wires are formed by vertical posts fixed to the ground, separated from each other by a determined distance, for example from 5 to 50 meters, typically 25 to 50 meters.

  The yarns are metal or other yarns having sufficient mechanical strength for the desired anti-intrusion applications. In Figure 1 are shown for illustration four son 3, 4, 5, 6, but of course a larger number of son is usually provided to form the entire height of the barrier. These son form between the posts 1, 2 for example a sheet, for example a plane to the figures. A sufficiently small space, for example 10 to 20 centimeters, is provided between the wires stretched between the posts 1, 2, to prevent the passage of a person between them, these son being for example parallel to the surface of the ground between the posts 1, 2, that is to say horizontally in Figures 1 and 2, and inclined relative to the horizontal H on a ground having the slope corresponding to Figure 4.

  The description is made in the following with reference to the first and second son 3 and 4.

  The wire 3 comprises first and second fasteners 31, 32 of its first and second ends to the first post 1. The wire 4 comprises first and second fasteners 41, 42 of its first and second ends to the second post 2. The fasteners 31, 32, 41, 42 are for example each associated with a tensioner 7 provided near these on the wire 3, 4, 5, 6, outside or in the pole.

  A first upper main section 33 of the wire 3 extends from the first end 31 to the second pole 2, where the wire 3 is returned by means 34 provided on the second pole 2 to shift it from a prescribed height towards the low. The wire 3 leaves the means 34 of the post 2 by a second lower main section 35 until its second end 32 fixed to the first post 1. The means 34 and the fasteners 31, 32 are further used to tension the wire 3 between the posts 1, 2. The fasteners 31, 32 of the wire 3 on the same pole 1 make it possible to equalize equally on its main sections 33 and 35 the voltage variations of the wire 3, due to the climatic changes, so as not to cause displacement on the intermediate section 36 and the sensor 37.

  In FIGS. 2 and 4, the return means 34 are formed by two upper and lower pulleys 341, 342, mounted on the post 2 and free to rotate with respect to axes perpendicular to the plane of the wires, forming two upper deflection means and inferior. The wire 3 preferably passes on the pulleys 341, 342 without going around. In other embodiments not shown, the means 34 could be formed by wire guide brackets 3 or the like, to form the main sections 33 and 35.

  The wire 3 thus comprises between its main sections 33 and 35 an intermediate portion 36, stretched between the pulleys 341, 342. Therefore, any displacement of the main section 33 of the wire 3 is to some extent thwarted by its other main section. 35, in order to prevent too large a distance from the equilibrium position and thus prevent the passage of a person between the posts 1, 2, but also exerts a force on the wire 3, which changes its voltage, and is passed through the means 34 on its intermediate portion 36 in the direction of its length.

  To the wire 3 is associated a sensor 37 for moving its intermediate section 36. Therefore, in the embodiment shown, the wire 3 is fixed at its ends to the same pole 1 and its associated detection device 37, mounted on the opposite pole 2.

  The means 34 for returning are for example provided so that the intermediate portion 36 is vertical, the measurement of the movement of the wire 3 is thus transferred to the vertical position.

  The sensor 37 is fixed to the second pole 2 by any appropriate means 25 and does not interrupt the continuity of the wire 3 and its intermediate portion 36 on which it is provided.

  The sensor 37 may be fixed, without limitation, independently in the plane of the barrier or perpendicular to this plane on either side of the wire 3 depending on the embodiment of the post 2, the positioning of the means 34 forcing referral the wire to move in the plane of the barrier. As shown in FIGS. 1, 2 and 4, the sensor 37 and the return means 34 may for example be integrated inside the post, which in this case makes them not only invisible but also non-locatable.

  Therefore, the post 2 is both the support post of the wire 3 and the support post of the wire displacement detection sensor 3 and saves a detector post between the posts 1, 2. Between the posts 1 , 2 may further be provided guides 8 for son, which promote their positioning, which can rest by additional poles on the ground but which do not include a son displacement detection sensor.

  1 o The mounting of the sensor 37 on the intermediate section 36 returned from the wire 3 makes it possible to overcome variations in tilting of the wire 3, related to the configuration of the ground, since the measurement of its displacement can always be reduced to the same direction. As shown in Figure 4, the measurement of the movement of the wire 3 is independent of the terrain configuration, which allows use in situations where existing solutions are inoperative.

  The foregoing description is also valid analogously for the second wire 4, which comprises, associated with it, elements 41, 42, 43, 44, 45, 46, 47 similar to but independent of those 31, 32, respectively. 33, 34, 35, 36, 37 associated with the first wire 3, by permuting the role of the first and second posts 1, 2.

  For example, the adjacent or consecutive main sections 33, 43, 35, 45 belong to different wires 3, 4, the wires 3, 4 being interposed with each other. In Figure 1, the main sections 33, 43, 35, 45 alternate in a plane transverse to the son and vertical, from top to bottom. For example, the fasteners 41 and 32 are at the same height as the sensors 37 and 47 on the columns 2 and 1. In the figures, the main sections 33, 43, 35 have an equal distance between themselves and the sensors 37, 47 are equidistant from their upper and lower return means. Thus, an individual who deviates the same amplitude two neighboring main sections 33, 43, 35, 45 would not be able to thwart the detection of movement of the son 3 and 4 by the sensors 37 and 47, since in this case 2870623 8 the spacing of neighboring sections would affect two different son 3 and 4, which would be detected by the sensors 37 and 47 provided on the two different posts 2 and 1. The detection is safer than in the case where the main sections the same wire would be neighbors without having another wire between them, because then a simultaneous separation of the same amplitude of the two neighboring main sections would not result in a displacement of the intermediate section and would not be detected by the sensor.

  The description is also valid analogously for the 1 o other son 5 and 6, which include, associated therewith, elements 51, 52, 53, 54, 55, 56, 57 and 61, 62, 63, 64 , 65, 66, 67 analogs to but independent of respectively those 31, 32, 33, 34, 35, 36, 37 and 41, 42, 43, 44, 45, 46, 47 associated with the son 3 and 4.

  Several barriers similar to that described above may be juxtaposed, for example to form a fence or delimit an enclosure.

  As can be seen in FIGS. 2 and 4, the posts 1, 2 can also be those of the neighboring barrier B 'of that B shown in FIG. 1, which makes it possible not to have to duplicate the posts and to lower again mounting costs. Only one type of post can then be used to form the entire fence, which greatly facilitates the implementation and avoids, unlike the detector pole barriers of the state of the art, to have to differentiate between the Detector poles and end posts. In this case, on the post 2, the fixed fasteners 41, 42 of the ends of a wire of a barrier are for example facing the return means 340 of the son 100 of the neighboring barrier, and vice versa, to alternate on their common post 2.

  The sensors of a barrier or a fence are described below with reference to the sensor 37 for moving the wire 3.

  The sensor 37 for moving the wire 3 is mounted on the associated intermediate section 36 and comprises, for example, a mobile mechanical part 371 displaced by the movements of this intermediate section 36.

  The sensor 37 and the mobile part 371 are for example provided equidistant from the means 341 and 342 in equilibrium position of the wire 3. The mobile part 371 is secured to the section 36 in one or more degrees of freedom of the latter, for example being moved in the direction of the length of the section 36. For this purpose, the movable portion 371 includes a point 372 for attachment to the section 36, as shown in FIG. 3, or, in other embodiments not shown, is pushed and / or pulled by appropriate means by the section 36, the lever 371 being stationary relative to the intermediate portion 36 in the equilibrium position of the wire 3. The spacing between the wires is optimized so that any attempt to cross by spacing son leads to a displacement of one or more intermediate sections, which is measurable by the associated sensor.

  The sensor 37 further comprises a detector 373 cooperating with the mobile part 371 to be sensitive to the movements of the latter. The detector 373 indicates a displacement of the wire 3 when the mobile part 371 is not in the equilibrium position imposed by the normal tension of the wire 3.

  The detector 373 is for example without mechanical contact with and at a distance from the mobile part 371 during its displacements, which favors the life of the sensor and limits the risk of oxidation and fouling thereof.

  The moving part 371 is for example a lever oscillating on an axis of rotation 374 fixed in a housing 375 of the sensor 37. The axis of rotation 374 of the lever 371 is in a plane transverse to the intermediate section 36 in the mounting position shown. of the sensor 37. A first side 376 of the lever 371 protrudes from a window 377 of the housing 375, turned towards the intermediate section 36, and includes the point 372 for attachment to the intermediate section 36 at a distance from the axis 374.

  The detector 373 is secured to the housing 375 fixed to the post 2 and is for example screwed on a corresponding receiving portion 381 of the housing 375. The detector 373 detects the displacement of a second side 378 of the lever 371, located opposite and away from the first side 376 relative to the axis 374. For example, the second side 378 has with respect to the axis 374 a distance greater than that of the first side 376, the axis 374 is thus off-center on the lever 371 , in order to amplify on the side of the detector 373 the deflection of the side 376 touched by the wire 3, as indicated by the arrows in FIG. 3. Of course, the axis of rotation 374 could be replaced by a ball joint allowing the lever 371 to rotate in two degrees of freedom in rotation.

  In the embodiment shown, the detector 373 is of magnetic type, and is sensitive to variations in the magnetic field produced by the displacement of a magnet 379 carried by the second side 378, for example at its end. In the equilibrium state of the wire 3, corresponding to the normal voltage of the wire 3, and therefore in the absence of displacement of its intermediate portion 36, the magnet 379 for example faces the detector 373 as shown 3. The position of the magnet 379 on the lever 371 can be adjusted to facilitate the focusing of the sensor, for example by guiding the magnet 379 in its housing of the lever 371.

  In FIG. 3, the housing 375 further comprises two limit stops 382 and 383 for limiting the stroke of the side wall 378 of the lever 371, the detector 373 indicating a displacement of the wire 3 when the side 378 of the lever 371 is against the stop 382 or 383. This thus protects the magnet 379 of the sensor during an abnormal movement of the wire 3.

  The detector 373 is for example Hall effect in the figures, or is magnetoresistive, to provide on electrical conductors 380 an electrical signal representative of the variations of the magnetic field of the magnet 379 and the position of the lever 371. This signal can be analyzed and treated by a unit not shown, located at a distance from the barrier, in order to discriminate the movements of the wire 3 related to the events of attempts to cross the barrier with respect to magnetic field variations related to the weather, to climate change, to noise electromagnetic or other. The detector 373 could also be an on-off type switch such as an ILS sensor (flexible reed switch) consisting of two flexible magnetic low-reluctance metal blades, each sealed at one end of a glass tube containing a gas. inert allowing large switching frequencies), this switch being in the normally open position (respectively closed) in the equilibrium position of the wire 3 and in the closed position (respectively open) in case of deviation of the lever relative to this position of balance, an electrical circuit connected to the switch to know whether or not the wire is in its equilibrium position.

  The possibility of using the two types of detectors described above for the same sensor allows according to the embodiment to choose the level of intrusion detection analysis. The detector 373 could also be of any other type than those described above, which gives a certain flexibility to the sensor. The sensor 37 for moving the wire 3 can be analog, digital, all or nothing type.

  Optionally, the sensors of a barrier or fence may all be of the same type, or be of different types from each other. The other sensors are for example of the same type as the sensor 37 described above. The sensors of a barrier or a fence are independent of each other and are connected by any appropriate means to a central unit for analyzing the detection signals they provide, not shown. The energy supply means of the sensors are provided if necessary in the pole on which they are mounted.

  In the case where the sensors are of the normally open switch type in equilibrium position, they can be associated in parallel in the central unit, and in the case where the sensors are of the normally closed switch type in equilibrium position. they can be connected in series in the central unit.

  The sensors of the same barrier B make it possible to locate the height of the crossing attempt thanks to their independence, or to detect this attempt globally in the case where several sensors indicate this attempt.

  The barrier according to the invention is therefore simple to implement and is scalable according to the needs of the user.

  The return means of the wire 3 may be provided only on the second pole 2, as is the case in the embodiment shown in the figures or, in other embodiments not shown, other means of return and tension of the same first wire 3 may be provided on the first post 1 instead of the fasteners 31, 32, so that the wire 3 make several trips and / or returns between the posts 1, 2 before being fixed by its ends at the post 1 and / or 2.

2870623 13

Claims (15)

  1. Barrier comprising two first and second uprights (1, 2), which support and between which are stretched son (3, 4, 5, 6) intended to form an obstacle to the passage of persons, and at least one first sensor ( 37) for detecting the displacement of a first (3) of the wires, characterized in that means (34) for returning and tensioning the first wire (3) and the sensor (37) are mounted on the second upright (2). ) for detecting the displacement of an intermediate section (36) of the first wire (3), this intermediate section (36) of the first wire (3) being continuous, stretched by the means (34) for returning and tensioning the first wire (3) and connected to two main sections (33, 35) of the first wire (3), which are stretched between the first and second uprights (1, 2) and which lie along the length of the first wire (3) between the two ends (31, 32) of the first wire (3) and the means (34) of return and tension of the first wire (3), said first wire (3) being called first detection wire.   2. Barrier according to claim 1, characterized in that the first wire (3) is fixed by its two ends (31, 32) to the first upright (1) and the means (34) of return and tension of the first wire ( 3) are mounted only on the second upright (2).   3. Barrier according to claim 2, characterized in that said son (3, 4, 5, 6) comprise at least a second wire (4) fixed by its two ends (41, 42) to the second upright (2) and passing in means (44) for returning and tensioning the second wire (4), mounted only on the first upright (1), on which is provided a sensor (47) for detecting the displacement of an intermediate section (46) of the second wire (4), the intermediate section (46) of the second wire (4) being continuous, stretched by means (44) for returning and tensioning the second wire (4) and connected to two main sections (43, 45) of the second wire (4), which are stretched between the first and second uprights (1, 2) and which lie along the length of the second wire (4) between the two ends (41, 42) of the second wire (4). ) and the means (44) for returning and tensioning the second wire (4), said second wire (4) being called the second wire of detection, the main sections cipals (33, 35, 43, 45) of the alternating first and second yarns (3, 4).   4. Barrier according to any one of the preceding claims, characterized in that the means (34) of return and tension of the wire (3) of detection comprise at least two means (341, 342) of return and tension of the wire (3) detection in at least two locations different from its length, the sensor (37) for detecting the displacement of the wire (3) detection being provided on the intermediate portion (36) thereof, located between said two locations .   Barrier according to any one of the preceding claims, characterized in that the sensor (37) for detecting the displacement of the detecting wire (3) comprises a mobile detection part (371) displaced by the intermediate section (36) of this wire (3) of detection.   6. Barrier according to any one of the preceding claims, characterized in that the means (34) for returning and tensioning the wire (3) of detection comprise at least two pulleys (341, 342) distant return wire (3). ) of detection, defining between them the intermediate portion (36) of the wire (3) detection.   7. Barrier according to any one of the preceding claims, characterized in that the displacement sensor (37) and the means (34) of return and tension are integrated in the amount (2) on which they are provided.   Barrier according to any one of the preceding claims, characterized in that the sensor (37) for detecting the displacement of the detection wire (3) comprises a movable part (371) fixed to the intermediate section (36) of this wire. (3) detection according to at least one degree of freedom thereof, and a detector (373) for moving the moving part (371) relative to an equilibrium position of the detection wire (3).   2870623 15 9. Barrier according to claim 8, characterized in that the sensor (373) for moving the movable part (371) is without mechanical contact with the movable part (371).   10. Barrier according to claim 8 or 9, characterized in that the detector (373) for moving the movable part (371) is of the magnetic type.   11. Barrier according to any one of claims 8 to 10, characterized in that the movable portion (371) of the sensor (37) for detecting the displacement of the wire (3) detection is formed by a lever oscillating relative to the less than one axis (374) of rotation transverse to the wire (3) of detection, the lever (371) being fixed by a first side (376) to the intermediate portion (36) of the wire (3) of detection along at least the direction of longitudinal displacement thereof and having a second side (378), which is opposite to the first side (376) with respect to the axis (374) of rotation and whose displacement is detected by the detector (373).   12. Barrier according to claims 10 and 11, characterized in that the second side (378) of the lever (371) carries a magnet (379) cooperating with the detector (373).   13. Barrier according to claim 11 or 12, characterized in that the second side (378) of the lever (371) is farther from the axis (374) of rotation than the first side (376).   Barrier according to any one of Claims 11 to 13, characterized in that the displacement detection sensor (37) comprises limit stops (382, 383) for limiting the stroke of the second side (378) of the lever (371). ).   15. Fence comprising at least one barrier (B) according to any one of the preceding claims.